![]() ![]() G10K9/00- Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g.G10K- SOUND-PRODUCING DEVICES METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL ACOUSTICS NOT OTHERWISE PROVIDED FOR.H04R17/00- Piezo-electric transducers Electrostrictive transducers.H04R- LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS DEAF-AID SETS PUBLIC ADDRESS SYSTEMS.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from JP2004215888 external-priority Application filed by Hokuriku Electric Industry Co Ltd filed Critical Hokuriku Electric Industry Co Ltd Priority to JP2006529317A priority Critical patent/JP4729496B2/en Publication of JPWO2006009279A1 publication Critical patent/JPWO2006009279A1/en Application granted granted Critical Publication of JP4729496B2 publication Critical patent/JP4729496B2/en Status Active legal-status Critical Current Anticipated expiration legal-status Critical Links Original Assignee Hokuriku Electric Industry Co Ltd Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) ( en Inventor 昇三 西山 昇三 西山 Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number JP2006529317A Other languages Japanese ( ja) Closed windows have much less effect on reducing road traffic noise since much of the transmission in this case is through the ground and the building structure.Download PDF Info Publication number JPWO2006009279A1 JPWO2006009279A1 JP2006529317A JP2006529317A JPWO2006009279A1 JP WO2006009279 A1 JPWO2006009279 A1 JP WO2006009279A1 JP 2006529317 A JP2006529317 A JP 2006529317A JP 2006529317 A JP2006529317 A JP 2006529317A JP WO2006009279 A1 JPWO2006009279 A1 JP WO2006009279A1 Authority JP Japan Prior art keywords electrode diaphragm piezoelectric conductive piezoelectric element Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. The effect is similar to closing a window to reduce noise from aircraft. When it is placed in the chamber before evacuation, the sound level reduces significantly since transmission to the observer is now through the walls of the chamber which vibrate very little compared to free air. ![]() The sound level from the generator is very high in open air. Running the pump for 2 minutes does not remove twice as much air as for 1 minute. Removal of air is rapid initially, but as the density of the air reduces, the amount removed is less. An effective demonstration with none of the complications of the traditional apparatus.Ī motorized pump should evacuate the chamber in about 30 seconds to 1 minute. Sound returns when the air is allowed back into the chamber. When the unit is connected to a vacuum pump, the air can be removed, and the effect of sound being unable to pass through a vacuum clearly demonstrated. The apparatus features a piezo buzzer enclosed within a clear acrylic tube suspended between two posts limiting the transfer of sound, and is controlled by a switch that has a red LED attached to show that it is on. Our Piezo Buzzer in Vacuum Chamber is the modern replacement for the Bell Jar & Ringer. ![]()
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